Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3040a3ac202a8b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 18:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 673a2ded16d794836fcdffb3d8397a27 SHA-1: 0d4a8f78c00c77ab531cdb15b0007c14a5150d42 SHA-256: 4b3040a3ac202a8bdc46d97a8858f89ef1b63283c6afdad77c0b561752718ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mma-montessori.com/admin/ckfinder/userfiles/files/92229826408.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d719adf075---fubakifoxopunezido.pdfIn PDF document text
    • http://humanlitech.com/files/files/83948188472.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/71496406796.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gedabefitu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/19739375991.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/13440672807.pdfIn PDF document text
    • http://strandedtattoo.net/file/68261258900.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec34817659---bofaw.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1627093657.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/gorimam.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e1544214d---mufedijo.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/28924438306.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vajotowonizemug.pdfIn PDF document text
    • http://findacommodity.com/upload/file/reguzufax.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/13222121399.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64044698359.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/21869019237.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608736c13ac12---20948772284.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc1cc15ec---xidojetapubenejazuz.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47350647997.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/96668451011.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/7530232484.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/33475467893.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/firufokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=search+inside+yourself+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 10908 bytes
SHA-256: 4ab1566a032606434a0282fdd3bedb05cff50bd7e0bdadc6e368e95e18bedea1
font_01_sfnt_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 16160 bytes
SHA-256: 3aa42e88918c044e607259e6d9cd55e883ec39b4e40f86a3f7029e139e0071c5

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